Which of the following is not true of a stationary time series?  The process generating the data has a constant mean.  The time series plot is a straight line.  The statistical properties are independent of time.  The variability is constant over time.

Which of the following represents the characteristics of a stationary time series?Answer choicesSelect only one optionREVISITA series with a constant mean over a given time intervalA series with a constant mean and variance over a given time intervalA series with a constant mean and fluctuating variance over a given time intervalA series with a varying mean and constant variance over a given time interval

Trend-stationarity implies that while a time series may have time-varying mean, its variance and covariances remain constant over time. True or False

Stationarity means that the: a. time series does not exhibit severe fluctuations. b. error terms are not correlated. c. forecasts remain within 1.96 standard deviation outside the sample period. d. probability distribution of the time series variable does not change over time.

What does the term "stationarity" refer to in time series analysis?Review LaterA time series that does not change over timeA time series with a constant mean and varianceA time series with a linear trendA time series with no seasonal patterns

When do you say that a Time Series is white noise?Answer choicesSelect only one optionREVISITWhen it has a constant mean of zero, a constant variance and there is a correlation between its values at different timesWhen it has a constant mean of zero, a constant variance and no correlation between its values at different timesWhen it has a constant mean of one, a constant variance of zero and no correlation between its values at different timesNone of the above